Tool for breaking concrete and the like



Patented June 19, 1951 TOOL FOR BREAKING OON CRETE AND THE LIKE Vincent N eamand, Warminster Township, Bucks County, Pa.

Application November 7, 1949, Serial No. 125,857

This invention relates totools for breaking I concrete and the like, and more particularly to an improved percussively operated tool for this purpose.

It is the principal object of the present invention to provide a tool for breaking concrete and the like which is capable of use for'impact penetration, cutting and breaking, as well as for a leverage effect upon the edge of penetrated material.

It is a further object of the present invention to provide a percussively operated tool for breaking concrete and thel like having an improved shape with which advantages not heretofore obtained are made available. E

It is a further object of the present invention to provide a percussively operated tool for breaking concrete and the like having a forward tapered end portion connected to an intermediate body portion of particular shape at the end of which a connecting end or shank is provided for engagement with a socket in the chuck of a pneumatic hammer.

Other objects and advantageous features of the invention will be apparent from the specification and claims.

The nature and characteristic features of the invention will be more readily understood from the following description, taken in connection with the, accompanying drawings forming part hereof, in which:

Figure 1 is a side elevational view of a tool in accordance with the present invention;

Fig. 2 is an end elevational View thereof;

Figs. 3, 4, 5, 6, and '7, are transverse sectional views, enlarged, taken respectively on the lines 3-3, 4 4, 5-5, 6 6, and 1 1; of Fig. 1.l

It should, of course, be understood 'that the description and drawings herein are illustrative merely, and that various modications and changes may be made in the structure disclosed without departing from the spirit of the invention.

Referring now more particularly to the drawings, the tool in accordance with the present invention preferably includes an elongated body II) having at the forward or working end thereof a I pair of opposed tapered or converging end faces II, forming a chisel point, and, if desired, at the forward ends thereof the tool may be sharpened to provide inclined cutting faces I2. The faces II may, if desired, have a slight curvature between their vertical margins as illustrated in Fig. 7. At the opposite end of the body of the tool, a shank I3, preferably of hexagonal cross- 3-Claims. (01.262-33) section, is provided for engagement with a complementally formed socket in the chuck of a pneumatic hammer (not shown), and a collar I4 of conventional type may be provided at the inner end of the shank I3. Between the end faces II and the collar I4, an intermediate portion I6 is provided, preferably bounded by a pair of flat parallel side faces I5 which extend to the forward end or faces I2 of the tool body I0, and by a pair of opposed side marginal faces Il which extend between and connect the side faces I5. The side faces Il may be of Vany preferred shape in transverse cross-section but are preferably arcuate as illustrated in Fig. 6.

At the inner terminal portions of the side faces I5 and I'I an integral cylindrical connecting portion I8 is provided which extends to the shank I3 and with which it is integral.

The side faces I1 are preferably gradually tapered with a converging .taper from their junction with the inner terminals of the faces I2 to the cylindrical portion I8. It will thus be seen that there is a larger cross-sectional area of the bodyl |01 at the inner ends of the faces I I, as indicated in Fig. 6, with a decreasing cross-sectional area between the parallel faces I5 to the junction of the faces I5 and I'I with the connecting por-Y tion I8.

The tool is preferably made of a single piece of alloy steel capable of being hardened throughout to obviate mushrooming of the point in use, and to permit of regrinding to the desired shape upon the occurrence of wear.

In the use of the tool, the same is operated with its end faces II and with its faces I2 in contact with the material to be penetrated and broken, and suitable impacts are imparted thereto by a pneumatic hammer in the usual manner. As the faces II and I2 penetrate the material, a wedging effect is obtained by reason of the inclination of the faces Il which tends to break apart the material as penetration occurs. Upon further entry of the tool into the material to be broken, the inner ends of the end faces II may penetrate below the outer surface thereof, and the tool may be employed as a bar or lever with the application of force parallel to the side faces I5 for breaking up and splitting the material. As the inner ends of the faces II pass below the outer surface of the material, being penetrated,

there is no binding effect and the tool may be readily withdrawn, if desired or required, to start a new hole. If, at any time, the tool requires resharpening, this may be readily effected without substantial change from the initial shape by grinding.

It will be noted that between and with the parallel side faces l5 a maximum cross-sectional area is provided at the inner ends of the terminal faces i i and a minimum cross-sectional area is provided at the outer end of the connecting portion i8.

I claim:

1. In a percussively operated tool for breaking concrete and the like, an elongated body portion having an actuating shank at one end andf a pair of converging terminal faces at the other end thereof, said body from saidother end thereof and from the outer ends of the terminal faces being bounded by a pair of parallel side faces decreasing in Width from the inner ends` of said terminal faces, said parallel faces being con nected by side faces converging from the inner ends of the terminal faces.

2. In a percussively operated tool for breaking concrete and the like, an elongated body por tion having an actuating shank at one end and a pair of converging terminal faces at the other end thereof, said body from said other end thereof and from the outer ends of the terminal faces being bounded by a pair of flat parallel side faces, said parallel faces being connected by side faces transversely arcuate and corn/'ergingr from the inner ends of the terminal faces.

3. In a percussively operated tool for breaking concrete and the like, an elongated body portion having a shank at one end and a connecting portion extending from said shank towards the other end, the other end of said body portion having a pair of converging terminal faces, the body portion transversely of said teru minal faces being bounded by a pair of parallel side edge faces and, on sides corresponding with said end faces, being bounded by connecting edge faces connecting the margins of the parallel faces, said connecting edge faces and the margins of said parallel faces converging from the inner ends of said terminal faces to said connecting portion, and said body portion having a maximum cross sectional area at the inner ends of said terminal faces and a minimum cross sectional area at said shank connecting portion.

VINCENT NEAMAND.

REFERENCES CITED The following references are of record in the file of this patent.'

FOREIGN PATENTS Number Country Date 13,511 Great Britain July 12, 1893 442,912 Great Britain Feb. 13, 1936 OTHER REFERENCES Page 55, Catalog 52-B, Third Edition-Independent Pneumatic Tool Co., 600 W. Jackson Blvd., Chicago 6, Illinois. 

